I don't recommend declawing. It's painful for the cat. Before I really knew what declawing was, I had my cat declawed as an adult, and he never walked the same again. Instead of that loose, fluid movement cats have, he walked "clunkier". They remove the first knuckle when they declaw, so it would be like having your toes amputated at the first knuckle.
I worked at a shelter and handled hundreds of cats. I also grew up having cats, and had cats as an adult. These are the things I recommend instead of declawing:
Clip your cat's nails. We had a cat that we HAD to clip her nails regularly. Even with all her toys and scratching posts, her nails would grow very long and irritate her. It's very easy to clip a cat's nails. If need be, get a helper and wrap the cat in a towel with the paw you are going to clip out, and the others inside so he can't scratch you. Have someone hold the cat, and you gently press the toe so the claw comes out, clip it close to the quick, the little white or pink part of the cat's claw, but DON'T clip the quick. It's painful and could start bleeding. After a while, your cat WILL get used to this, trust me. You just have to be consistent. This won't stop him from scratching, and isn't as good as claw covers, since it's possible he could still break skin, but it won't be as likely. Now on to my favorite...
I like the claw covers. We've used them on cats we had before, and ultimately, they are NOT that expensive. We used Softpaws nail covers. They're about $20 for 40 nail caps, and a pack will last you about 5 months. Considering a declawing surgery can cost upward of $200, nail caps aren't that bad of a deal.

They come in all kinds of colors, and clear in case you don't want your boy wearing "nail polish".

We put them on ourselves when we clipped our cat's claws. Here's a link to their website:
http://www.softpaws.com/
To stop him from scratching furniture, get a scratching post, or a couple, and spray it with catnip spray. Get a spray bottle and fill it with water. When your cat starts to scratch furniture or people, or starts getting too rough, spray him and say NO! Keep it up and be consistent. Don't play with him using your hands or feet EVER. Always use a toy. I like laser pointers and these toys that look like fishing poles with feathers instead of a hook. If he starts going for your hands/feet/legs, spray and say NO.
Please reconsider declawing. It's really a very awful process. Many places have stopped doing it and even declared it inhumane and illegal in some countries.